Hmmmm.....

"OPPOsaurus WRX" (opposaurus) 07/30/2015 at 10:13 • Filed to: None

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so i got into the brakes a bit more yesterday. I took the wheel off and pilled the capiler. The brake pads secures to the piston with a clip. When I tried pulling the pad off I was able to move the piston by hand. I didn;t know if this was ok cuz I always thought you needed some sort of clamp to move the piston. There is no sign of brake fluid leak. I put the current parts back together (new pads and rotors are on their way) and I did a couple hard stops and the ABS did not come on and the rear brakes were hot. I still dont get why they look so crappy

SidewaysOnDirt still misses Bowie > OPPOsaurus WRX 07/30/2015 at 10:25

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You shouldn’t be able to move the caliper piston by hand. That sounds to me like there’s no hydraulic pressure. Any kinks in your brake lines? I’m still thinking master cylinder because of the fact that it’s affecting both wheels.

crowmolly > SidewaysOnDirt still misses Bowie 07/30/2015 at 10:29

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I think the master is suspect too.

Twingo Tamer - About to descend into project car hell. > OPPOsaurus WRX 07/30/2015 at 11:04

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As others said being able to push the piston by hand doesn't sound good. Usually takes me tools and a good amount of time to compress them again.

OPPOsaurus WRX > SidewaysOnDirt still misses Bowie 07/30/2015 at 11:17

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i didn;t check the like the whole way back but it is applying pressure as the disk was hot after stopping. I agree tho, i didn;t think they should move that easily.

Garrett Davis > OPPOsaurus WRX 07/30/2015 at 11:26

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Hmmm. You might have some serious bubbles in the fluid, or your master cylinder might be pretty far gone. There’s no way you should be able to move the pistons by hand.

OPPOsaurus WRX > Garrett Davis 07/30/2015 at 11:31

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would you eliminate the piston/caliper as the issue?

SidewaysOnDirt still misses Bowie > OPPOsaurus WRX 07/30/2015 at 11:33

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That doesn’t mean that it has pressure. It just means that there’s friction. The pad doesn’t have to be being pressed against the disc to drag on it and generate heat.

SidewaysOnDirt still misses Bowie > OPPOsaurus WRX 07/30/2015 at 11:35

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I would have ruled that out by looking at the other disc. It’s not likely that both will fail in the same way at the same time.

Garrett Davis > OPPOsaurus WRX 07/30/2015 at 11:36

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Yes, as long as the piston boot is in good shape and isn’t leaking, the caliper is probably fine. I would bleed the brakes and see how that feels. If that doesn’t fix it, it’s most likely master cylinder time. Brake systems are pretty cut and dry to diagnose in these cases.

How does the pedal feel?

OPPOsaurus WRX > Garrett Davis 07/30/2015 at 11:55

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the only time i thought it felt weird was when coming to a stop while turning. i tried seeing if it would sink just from holding my foot on it and it seemed like it did very slowly but i couldnt tell if i was imagining it or not

Garrett Davis > OPPOsaurus WRX 07/30/2015 at 12:08

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Start with bleeding the brakes. If you really boiled your fluid recently that could cause some problems.